A good number of adverbs can be made from adjectives, by adding -ol
to the end if the adjective ends in a consonant or in -i, or -l if the
adjective ends in -o or -u. If the word ends in -a or
-e, the vowel is dropped and replaced with -ol. If the word ends in
-ui, the u is dropped (-ui + -ol becomes -iol).

This listing is of the adverbs not formed in this way.
(There are still a few -ol endings in this list, though, at least one of them
irregular.)